The MEC 600Jr is available for the .410. LEE doesn't make a .410 Load All- unfortunately. Check with Ballistic Products. They will have all the shotshell reloading equipment and components you will need. I've been trading with them for about 10 years now for my CAS shotgun reloading.
Just don't be surprised by the prices. Any shot shell reloading other than 12 and 20 gauge is in the niche/specialty market category and you pay niche/specialty market prices. At least you have a currently used chambering. I broke into shotshell reloading because I picked up an antique shotgun chambered in an obsolete hull length that hasn't been produced in the last 50 years.
I'd suggest getting a reloading manual or 2 and figuring out what components you need to do what you want. Shot shell reloading- if you haven't done it before- isn't like metallic cartridge reloading. You can get away with swapping 1 brand of primer for another as long as it is the same type primer most of the time with metallic pistol cartridges.
The reloading formulas for shotgun shells, on the other hand, are set up for the precise combination of components (hull, powder, wad, shot, primer) listed. You can't swap Wad X for Wad Y unless it is intentionally made as a substitute (like some of the Claybuster brand wads that are made as a 'generic equivalent' version of some the brand name wads). Follow the book EXACTLY and you will do fine once you get the mechanics of running the press down. Talk with the folks a Ballistic Products, they are quite knowledgeable about shotshell reloading, if you decide to order from them.